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path: root/selinux/chcon.c (plain)
blob: c3a1858d7ec315f1e0e45c3446838eb91771956d
1/*
2 * chcon -- change security context, based on coreutils-5.97-13
3 *
4 * Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
5 *
6 * Copyright (C) 2006 - 2007 KaiGai Kohei <kaigai@kaigai.gr.jp>
7 *
8 * Licensed under GPLv2, see file LICENSE in this source tree.
9 */
10//config:config CHCON
11//config: bool "chcon"
12//config: default n
13//config: depends on SELINUX
14//config: help
15//config: Enable support to change the security context of file.
16//config:
17//config:config FEATURE_CHCON_LONG_OPTIONS
18//config: bool "Enable long options"
19//config: default y
20//config: depends on CHCON && LONG_OPTS
21//config: help
22//config: Support long options for the chcon applet.
23
24//applet:IF_CHCON(APPLET(chcon, BB_DIR_USR_BIN, BB_SUID_DROP))
25
26//kbuild:lib-$(CONFIG_CHCON) += chcon.o
27
28//usage:#define chcon_trivial_usage
29//usage: "[OPTIONS] CONTEXT FILE..."
30//usage: "\n chcon [OPTIONS] [-u USER] [-r ROLE] [-l RANGE] [-t TYPE] FILE..."
31//usage: IF_FEATURE_CHCON_LONG_OPTIONS(
32//usage: "\n chcon [OPTIONS] --reference=RFILE FILE..."
33//usage: )
34//usage:#define chcon_full_usage "\n\n"
35//usage: "Change the security context of each FILE to CONTEXT\n"
36//usage: IF_FEATURE_CHCON_LONG_OPTIONS(
37//usage: "\n -v,--verbose Verbose"
38//usage: "\n -c,--changes Report changes made"
39//usage: "\n -h,--no-dereference Affect symlinks instead of their targets"
40//usage: "\n -f,--silent,--quiet Suppress most error messages"
41//usage: "\n --reference=RFILE Use RFILE's group instead of using a CONTEXT value"
42//usage: "\n -u,--user=USER Set user/role/type/range in the target"
43//usage: "\n -r,--role=ROLE security context"
44//usage: "\n -t,--type=TYPE"
45//usage: "\n -l,--range=RANGE"
46//usage: "\n -R,--recursive Recurse"
47//usage: )
48//usage: IF_NOT_FEATURE_CHCON_LONG_OPTIONS(
49//usage: "\n -v Verbose"
50//usage: "\n -c Report changes made"
51//usage: "\n -h Affect symlinks instead of their targets"
52//usage: "\n -f Suppress most error messages"
53//usage: "\n -u USER Set user/role/type/range in the target security context"
54//usage: "\n -r ROLE"
55//usage: "\n -t TYPE"
56//usage: "\n -l RNG"
57//usage: "\n -R Recurse"
58//usage: )
59
60#include <selinux/context.h>
61#include <selinux/selinux.h>
62#include <selinux/label.h>
63#include "libbb.h"
64
65#define OPT_RECURSIVE (1<<0) /* 'R' */
66#define OPT_CHANHES (1<<1) /* 'c' */
67#define OPT_NODEREFERENCE (1<<2) /* 'h' */
68#define OPT_QUIET (1<<3) /* 'f' */
69#define OPT_USER (1<<4) /* 'u' */
70#define OPT_ROLE (1<<5) /* 'r' */
71#define OPT_TYPE (1<<6) /* 't' */
72#define OPT_RANGE (1<<7) /* 'l' */
73#define OPT_VERBOSE (1<<8) /* 'v' */
74#define OPT_REFERENCE ((1<<9) * ENABLE_FEATURE_CHCON_LONG_OPTIONS)
75#define OPT_COMPONENT_SPECIFIED (OPT_USER | OPT_ROLE | OPT_TYPE | OPT_RANGE)
76
77static char *user = NULL;
78static char *role = NULL;
79static char *type = NULL;
80static char *range = NULL;
81static char *specified_context = NULL;
82
83static int FAST_FUNC change_filedir_context(
84 const char *fname,
85 struct stat *stbuf UNUSED_PARAM,
86 void *userData UNUSED_PARAM,
87 int depth UNUSED_PARAM)
88{
89 context_t context = NULL;
90 security_context_t file_context = NULL;
91 security_context_t context_string;
92 int rc = FALSE;
93 int status = 0;
94
95 if (option_mask32 & OPT_NODEREFERENCE) {
96 status = lgetfilecon(fname, &file_context);
97 } else {
98 status = getfilecon(fname, &file_context);
99 }
100 if (status < 0 && errno != ENODATA) {
101 if ((option_mask32 & OPT_QUIET) == 0)
102 bb_error_msg("can't obtain security context: %s", fname);
103 goto skip;
104 }
105
106 if (file_context == NULL && specified_context == NULL) {
107 bb_error_msg("can't apply partial context to unlabeled file %s", fname);
108 goto skip;
109 }
110
111 if (specified_context == NULL) {
112 context = set_security_context_component(file_context,
113 user, role, type, range);
114 if (!context) {
115 bb_error_msg("can't compute security context from %s", file_context);
116 goto skip;
117 }
118 } else {
119 context = context_new(specified_context);
120 if (!context) {
121 bb_error_msg("invalid context: %s", specified_context);
122 goto skip;
123 }
124 }
125
126 context_string = context_str(context);
127 if (!context_string) {
128 bb_error_msg("can't obtain security context in text expression");
129 goto skip;
130 }
131
132 if (file_context == NULL || strcmp(context_string, file_context) != 0) {
133 int fail;
134
135 if (option_mask32 & OPT_NODEREFERENCE) {
136 fail = lsetfilecon(fname, context_string);
137 } else {
138 fail = setfilecon(fname, context_string);
139 }
140 if ((option_mask32 & OPT_VERBOSE) || ((option_mask32 & OPT_CHANHES) && !fail)) {
141 printf(!fail
142 ? "context of %s changed to %s\n"
143 : "can't change context of %s to %s\n",
144 fname, context_string);
145 }
146 if (!fail) {
147 rc = TRUE;
148 } else if ((option_mask32 & OPT_QUIET) == 0) {
149 bb_error_msg("can't change context of %s to %s",
150 fname, context_string);
151 }
152 } else if (option_mask32 & OPT_VERBOSE) {
153 printf("context of %s retained as %s\n", fname, context_string);
154 rc = TRUE;
155 }
156skip:
157 context_free(context);
158 freecon(file_context);
159
160 return rc;
161}
162
163#if ENABLE_FEATURE_CHCON_LONG_OPTIONS
164static const char chcon_longopts[] ALIGN1 =
165 "recursive\0" No_argument "R"
166 "changes\0" No_argument "c"
167 "no-dereference\0" No_argument "h"
168 "silent\0" No_argument "f"
169 "quiet\0" No_argument "f"
170 "user\0" Required_argument "u"
171 "role\0" Required_argument "r"
172 "type\0" Required_argument "t"
173 "range\0" Required_argument "l"
174 "verbose\0" No_argument "v"
175 "reference\0" Required_argument "\xff" /* no short option */
176 ;
177#endif
178
179int chcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
180int chcon_main(int argc UNUSED_PARAM, char **argv)
181{
182 char *reference_file;
183 char *fname;
184 int i, errors = 0;
185
186#if ENABLE_FEATURE_CHCON_LONG_OPTIONS
187 applet_long_options = chcon_longopts;
188#endif
189 opt_complementary = "-1" /* at least 1 param */
190 ":?" /* error if exclusivity constraints are violated */
191#if ENABLE_FEATURE_CHCON_LONG_OPTIONS
192 ":\xff--urtl:u--\xff:r--\xff:t--\xff:l--\xff"
193#endif
194 ":f--v:v--f"; /* 'verbose' and 'quiet' are exclusive */
195 getopt32(argv, "Rchfu:r:t:l:v",
196 &user, &role, &type, &range, &reference_file);
197 argv += optind;
198
199#if ENABLE_FEATURE_CHCON_LONG_OPTIONS
200 if (option_mask32 & OPT_REFERENCE) {
201 /* FIXME: lgetfilecon() should be used when '-h' is specified.
202 * But current implementation follows the original one. */
203 if (getfilecon(reference_file, &specified_context) < 0)
204 bb_perror_msg_and_die("getfilecon('%s') failed", reference_file);
205 } else
206#endif
207 if ((option_mask32 & OPT_COMPONENT_SPECIFIED) == 0) {
208 specified_context = *argv++;
209 /* specified_context is never NULL -
210 * "-1" in opt_complementary prevents this. */
211 if (!argv[0])
212 bb_error_msg_and_die("too few arguments");
213 }
214
215 for (i = 0; (fname = argv[i]) != NULL; i++) {
216 int fname_len = strlen(fname);
217 while (fname_len > 1 && fname[fname_len - 1] == '/')
218 fname_len--;
219 fname[fname_len] = '\0';
220
221 if (recursive_action(fname,
222 option_mask32 & OPT_RECURSIVE,
223 change_filedir_context,
224 change_filedir_context,
225 NULL, 0) != TRUE)
226 errors = 1;
227 }
228 return errors;
229}
230
generated by cgit at 2024-05-15 20:41:58 (GMT)